This is a follow up to a previous post that I had about my initial results with the GT4088 journal baring turbo on E85. Tuning had previously stopped at about 20psi and 526WHP and 398WTQ due to a push tite fuel hose popping off a fuel pump. Those dyno charts can be view in the old thread located in the previous thread here.

With everything repaired tuning resumed. I was hoping that there was enough fuel to reach 25/26 psi which is where this turbo would be closed to maxed out at about 600whp. Unfortunately injector duty cycle reached 90% at 23 psi and I called it quits. Final results were 558WHP and 439WTQ. The run previous was actually 563WHP and 445WTQ but I did not get the dyno charts for that particular run.

The car is actually tuned pretty conservative for running on E85. A/F is low 11’s on boost and EGT’s are low to mid 15xx degrees under full boost. Something that I thought was interesting is EGT’s at idle and cursing show the rear rotor about 50 to 80 degrees warmer then the front but under full throttle temps get much closer and rear runs about 20 degrees cooler then the front. I’m guessing this is due to turbine housing being very close to the front rotor. EGT probes are placed 1 inch from each port using sensor connection K type probes.

Observations from the tuner were that the car did not take as much timing that he expected running on E85. That is it didn’t make any more power given more timing so basically there was no reason to give it more.

I couldn’t be happier on how this set up has turned out. The car idles extremely well. Solid and smooth idle at 900 – 1000 rpm on a ported motor. Response and street driving is fantastic. Tip in is excellent. Top end is unreal! Just cursing around and normal driving, you would never know the type of power the car is capable of. Tony at UMS Tuning really knows his stuff. Excellent tuner that is located in AZ. I have not seen any real results from the GT4088. This has be considered one of the best street turbos for the money. It looks like the response is not very far off from the GT35R based on charts and tuning on the same dyno that my tuner had done but with much more top end power.

Full Mod List
The car is a 1994 BB R2.

• AZ Rotary Rockets large street port build - About 3000 miles on motor.
• NEW housings
• NEW gaskets, seals, bolts, etc, etc
• AZRR balanced assembly
• CXRacing twin 25 row oil coolers
• -10 stainless braided oil cooler lines with AN fittings
• -8 feed & return with all AN fittings
• CJ Motorsports billet aluminum dual pump hanger with dual bosh 044’s
• Full aluminum pulley kit
• Greddy compression elbow
• Rotary Works 90mm throttle body
• Synapse Blow off valve
• HKS Carbon Ti catback
• Banzai Racing BOPs
• Custom aluminum AST coolant tank
• Custom aluminum oil catch can with dual -10 inlets that vent both sides of motor
• RX7Store downpipe
• RX7Store exhaust manifold
• Custom wastegate dump pipe
• Garret GT4088 turbo
• Tial wastegate
• HPC/Jet hot black 2500 degree Ceramic coating on manifold, turbine housing and down pipe
• Megan midpipe
• Xcessive LIM
• Ground Zero high capacity oil pan
• CJM billet fuel rails
• Aeromotive fuel pressure regulator
• Areomotive billet 10 micron fuel filter
• 4 Yaw Power 1000cc secondary injectors
• 2 Yaw Power 1000cc primary injectors
• Agency Power modified for V mount EVO9 radiator with custom aluminum full shroud and 12” electric fans
• Custom Agency Power V-mount intercooler and custom aluminum piping
• HKS Twin Power ignition
• Ignition coil relocation
• 10mm plug wires
• NGK 7420 10 leading 10.5 trailing plugs
• Exedy Hyper single clutch
• Exedy light flywheel
• Power FC with datalogit
• Profec B II boost controller
• Dual Mini Digital Pyrometer Gauge "SuperLite-A" Peak Hold & Analog Output displays with dual fast acting k type probes
• Prosport 52mm Boost, Coolant Temp, Oil Temp and Oil Pressure gauges.
• Innovative MX Wideband

 

Pics are not very good and the lighting is bad but here are a one more.

 

Sorry for some of the spelling and grammar errors. I did not proof read before i posted and I can not edit the post after 30 minutes

 

If you want any edits made just shoot me a PM

 

Awesome post!! I have almost same set up. Congrats!!!

 

Looks good.

I think what you mean is that lambda is around ~.75-.78 , which would be displayed as low 11's on a wideband in typical configuration. This is surely the reason for your low EGT's and would also help with suppressing preignition. In short, it's good for a conservative tune.

 

Great numbers, Tony and UMS is a great outfit for sure, went there a lot when I lived in Phoenix.

 

How is the cold start? I'm having hard time setting up cold with e85 any tips

 

What is you lead timing at 23psi at say 6000rpm?

 

Ive honestly have not had any issues at all on cold start up. Ive been tuning the car my self since October and have been driving it regularly. I switched to the NGK 7240's at the end of January and did not notice any difference even then. Idles smooth right away. I test the E85 I put in my car regularly and it has never been lower then 90% Ethanol. I don't know if I'm just lucky or if it is because most of the factory sensors on the throttle body are not used anymore.

 

+6 Leading, -2 trialling.

 

Congrats on your results!

This is Tim (guy who bought your tires). Very nice outcome. I know you've been working on this for some time. Tony does a great job tuning!

 

He does. After talking with him for 5 minutes I knew I was in good hands. I have a hard time trusting anyone touch my car but I have no issue letting him do anything to it. It like driving a new car compared to my tuning

 

Those are some high numbers for just 20psi and no bridge port. What dyno were you on?

 

Dyna Pack. Numbers in this thread ate at 23psi.

 

nice post bumb

 

congrats on the results! I plan on getting tuned on E85 in about a month.

 

Nice results man, looking good. The reason you are having "good" spool is due to the E85, it generates so much more exhaust.

I had a BP engine with a T04Z with a 1.32 housing before and had 15 psi of boost at 3000 rpm. Going to use the same engine this year with a GT4094R with a 1.06 housing and maybe E85, as it's about 2/3 of the price of gasoline. And we are up to over 10 USD a gallon.

JT

 

congrats on your setup and results.

i note you have a turbine cover. if you are still generating heat into your LIM i suggest you visit McMaster Carr, Mica and purchase a 1/8th inch thick 12 X 13 sheet of the"green w brown spots" Mica. cut it to fit and hang it off the studs from your LIM between the LIM and turbo. you will then have zero heat penetration.

re your Exedy Hyper Single clutch: it is a gem of a single plate clutch, i ran it for a couple of years and once i tuned to 500 rwhp i found it slipped and replaced it w the Exedy double disc cerametallic. i am pretty sure you will be following a similar route.

howard

 

very nice.. looks like about 1000-1200 higher to reach full boost than my 35r but your making 100 more hp!

 

Thanks for the suggestions. With the turbine cover there is literally no more space between the LM for anything else. Between the thermal coating and the turbine cover it seems to block a lot of heat. I can put my hand on the cover after its been driven hard.

As soon at the clutch or trans starts to go I am going to do the T56 swap as you did. Seems like the only really reliable way to go.

 

15psi by 3000rpm is unreal for a turbo with that much potential! If I'm not mistaken the T04Z is good for at least 100WHP more then what I am using now. Is the boost response for this turbo still pretty good on a SP engine?

 

The T04Z is only good for about 650rwhp on a rotary.

The reason for the great spool was a BP engine and E85. The E85 gave it a 800 rpm spool advance on 15 psi.

With regular premium fuel it had 15 psi at 3800 rpm or so. But still very good. The problem i had was that i could not limit the boost, min boost was 20.5 psi :P And this was with the wg with a 11.8 psi spring :P

This is the reason for me going for a GT4094R this year

JT

 

JT,

might the boost problem not be related to the turbo?

perhaps the WG was in-efficient? on my Jan 16 dyno session w the BW (which is capable of 77pounds per minute) i was able to run 16-17 off the spring and also run an extremely consistant 24. i expect to be able to run 30/34 w the same springs although i don't know this for a fact. ( 60 MM Tial WG)

howard

 

i'm blown away with these claimed WHP # from the 13B.

Attached is a screen shot from BW's hp calculator found here:
http://www.turbodriven.com/performan...6_wrsin=92044&

The arrows point to my input #s that I think should be somewhat realistic to arrive @ the claimed WHP (~10% loss crank2wheels). The BSFC is from what I've gathered as easonable @ peak power. The A/F ratio is what's mentioned. And I'm assuming the air being rammed thru the IC is equivalent to going 100+ mph.

Is near 150% volumetric efficiency @ peak power actually dueable?